I was trying to get at this in my opening remarks, but let's talk about some of the policy reasons for why performance might not be what was predicted. Especially on the homeowner side, there's very little in the business models of, say, contractors, that gives them an incentive to do very high performance. If you are installing a heat pump, for it to be sized properly, you should really do a heating load calculation first. After you install the heat pump, it should be commissioned, and ideally it should be monitored after the fact, but contractors don't make a lot of money doing that kind of work.
